minor #12993 [2.3] Docblocks should not be followed by a blank line (GrahamCampbell)

This PR was squashed before being merged into the 2.3 branch (closes #12993).

Discussion
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[2.3] Docblocks should not be followed by a blank line

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A

There should be no blank line(s) between phpdocs that document properties, interfaces, classes, functions, or traits. This pull request was a test run of a new php-cs-fixer: https://github.com/FriendsOfPHP/PHP-CS-Fixer/pull/864.

Commits
-------

4e7ba1b [2.3] Docblocks should not be followed by a blank line

src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php

@@ -155,7 +155,6 @@ class SecurityExtension extends Extension
      * @param array            $config    An array of configuration settings
      * @param ContainerBuilder $container A ContainerBuilder instance
      */
-
     private function createRoleHierarchy($config, ContainerBuilder $container)
     {
         if (!isset($config['role_hierarchy'])) {

src/Symfony/Component/HttpFoundation/BinaryFileResponse.php

@@ -1,6 +1,6 @@
 <?php
 
-/**
+/*
  * This file is part of the Symfony package.
  *
  * (c) Fabien Potencier <fabien@symfony.com>

src/Symfony/Component/HttpFoundation/Session/Storage/Handler/NativeSessionHandler.php

@@ -16,7 +16,6 @@ namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
  *
  * @see http://php.net/sessionhandler
  */
-
 if (PHP_VERSION_ID >= 50400) {
     class NativeSessionHandler extends \SessionHandler
     {

src/Symfony/Component/Process/Tests/NonStopableProcess.php

@@ -7,7 +7,6 @@
  *
  * @example `php NonStopableProcess.php 42` will run the script for 42 seconds
  */
-
 function handleSignal($signal)
 {
     switch ($signal) {